Bump RuboCop RSpec to 2.9

Author: koic

Gemfile

@@ -11,7 +11,7 @@ gem 'rake'
 gem 'rspec'
 gem 'rubocop', github: 'rubocop/rubocop'
 gem 'rubocop-performance', '~> 1.13.0'
-gem 'rubocop-rspec', '~> 2.5.0'
+gem 'rubocop-rspec', '~> 2.9.0'
 gem 'simplecov'
 gem 'test-queue'
 gem 'yard', '~> 0.9'

spec/project_spec.rb

@@ -92,7 +92,7 @@
     it 'does not include `Safe: true`' do
       cop_names.each do |name|
         safe = config[name]['Safe']
-        expect(safe).not_to eq(true), "`#{name}` has unnecessary `Safe: true` config."
+        expect(safe).not_to be(true), "`#{name}` has unnecessary `Safe: true` config."
       end
     end
   end

spec/rubocop/rails/schema_loader_spec.rb

@@ -13,7 +13,7 @@
 
     context 'without schema.rb' do
       it do
-        expect(described_class.load(target_ruby_version)).to be nil
+        expect(described_class.load(target_ruby_version).nil?).to be(true)
       end
     end